2679721278 has 64 divisors (see below), whose sum is σ = 6285081600. Its totient is φ = 754185600.

The previous prime is 2679721243. The next prime is 2679721279. The reversal of 2679721278 is 8721279762.

It is a super-2 number, since 2×2679721278² = 14361812255531906568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2679721278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2679721279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11803 + ... + 74153.

It is an arithmetic number, because the mean of its divisors is an integer number (98204400).

Almost surely, 2^2679721278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2679721278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3142540800).

2679721278 is an abundant number, since it is smaller than the sum of its proper divisors (3605360322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2679721278 is a wasteful number, since it uses less digits than its factorization.

2679721278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62417.

The product of its digits is 1185408, while the sum is 51.

The square root of 2679721278 is about 51766.0243596126. The cubic root of 2679721278 is about 1388.9817565546.

The spelling of 2679721278 in words is "two billion, six hundred seventy-nine million, seven hundred twenty-one thousand, two hundred seventy-eight".